Underfeed stoker, including cooled tuyere means



Aug. 21, 1951 F. l..` KYGER 2,565,240

UNDERFEED STKER, INCLUDING COOLED IUYERE MEANS Filed April 23, 1948 3 Sheets-Sheet 1 GEAR ASH wwer? 3M VACUUM F. l.. KYGER 2,565,240

VUNDERFEED STOKER, INCLUDING COOLED TUYERE MEANS Aug. 21, 1951 3 Sheets-Sheet 2 Filed April 25, 1948 Aug. 2l, 1951 F. L. KYGER 2,565,240

UNDEFEED STOKER, INCLUDING COOL-ED VTUYERE MEANS Filed April 23. 1948 5 Sheets-Sheet 5 EPA/wf L WGH? @www /S//S HTTX `lf'atentecll ug. 21',

UNITED STATES PATENT OFFICE NDEREnQsi/:oxnm Inc pomo cooLED trUYERE: MEANS v"fliailr L.*^Kyger, Streator, Ill. poliootiihbril's, lsda'isrial No. 22,839

"4 Claims.

v This invention rel'ajtesrto a stoke'r retort land has for one 'of its objects the productiono'f 'a simple and efcient retort which will ciently burn a poor grade of coal, such as bug dust 'and cause 'this poor grade of coal to burn 'evenly'a'nd 'thoroughly and to valso clinke'r perfectly.

A further object of this invention is 'the pro'- duction of a simple 'and eiiioient 'tuyrejfor sup-- plying air currents to vthe rebox on either side of the retort'to facilitate amaximum combustion.

Other objects and 'advantages of this invention will appear throughout the following 'specification and claims.

In the drawingsv A Figure 1 is atop plan view of a furnace andthe retort, the top or cap of the furnace being Are'- moved; i l n Figure 2 is a side velevational View of the retort and stolzer, certain portions being shown'in [seotion, and a portion ofthe `furnace being shown in dotted lines; v y i i Figure 3 is an enlarged irregular sectional view taken on line 3-3 of Figure l1 lookingtoward the hopper, the tuyres being shown in elevation; p

Figure 4 is an enlarged'sectional viewtakenon line 4--4 of Figure lilooking from the hopper to'- wardtheretort; y. n v v Figure 5 is a central longitudinal,sectonallview of the retort anda portion of coal tube :and'conveyor; Y Y A y l i Figure 6 is an enlarged vertical sectional 'view of one of the tuyres; i v

Figure 7 vis a horizontal sectional view'takenon line 'F--T of Figure 6 the support being 'elifni' hated; Y

Figure 8 is a front elevational view offthe detached baffle-plate which is mounted in the casing of each tuyre; n A

Figure 9 is a fragmentary verticalfsectional View of one of the tuyres anda portion Iof the fuel feeding trough.

K By referring to `the drawings, `it will `befseen that Ii! designates a conventional'furnaceof'any suitable type in which the'retort IjI fis mounted. The retort is provided with an upwardlyi'inclinjed bottom i2, below which -isiooatedtiio windlb'ox I 3. The wind box I3 issupplied w'ithagsuitable draft through the medium 'of `thejairjtoibe NI which vcommunicates with the windfjbox llf3, "at

the front end thereof. EFuoi `isi-foo ffrom the f hop'- v'per through the vcoal Vtube fIE byi'nieans of la Aconventionalspiral conveyor I'L A'Ihejinner ofthe Coal Duble ,1l preferahlyrasseis through *casing I8 which fornisla junction withither" trt I I. ",fheibottom I 2 is inclined upwardly and rear- :wfardlyl from the bottom of the lconveyor I'I to Vtlfie'innerend of the retort to an elevation y'subftiaii'yiniiine with the longitudinal axis of the-"conveyor I'I, as shown in Figure 5. The calsving t3 and the wind box I3 which carries the retort I, is supported upon'suitable supporting V'legs I9. `A suitable cover plate 28 is anchored uponthe casing I3 and the inner end of the coal tube I5 is anchored by -rneans of a lscrew 2| to the cover-plate Zihwhich plate is shaped to t the tube 'I' as shown in Figure 4. The tube I6 and 'spiral conveyor il' terminate at the mouth 22 of Atheretort I I, as shown in Figure 5. n 1

The retort -`I I is provided with the inclinedbottom I2' defining an inclined trough 23 andhaving upwardly and laterally diverging side walls 24 which Walls 24 terminate in laterally extending horizontal side ledges 25. These ledges 25 are `provided with a plurality of aligned. apertured fspckets 12h dening communicating Aports which plates 23 are secured to the ledges 25 and are vertically channelled as at 29, to receive the tuyres '721. The tuyres 2l are anchoredin the channels "E'Bfby means of suitable anchoring screws 3EI.

YEach tuyre 2'! comprises a substantially'vertivcal hollow cylinder having a closed top 13| and an open bottom 32, which open bottom communi- (fates with the apertured socket 26 in which it lsf'rnounted. The rear portion 33 of each tuyre '-is reduced in its transverse diameter Ito snugly "fit into the channel 29 of theanchoring plate 28 which is adapted to receive the same. The

'front :face 34 of each tuyre is4 provided ywith a plurality of vertically spaced horizontal Vslots '35 which extend approximately one-half the diameter of the tuyre, or around Vthefront face or 'half 'thereof so that the slots 35 will face in the 'direction of the trough 23. The tuyresfupon opposite `sides of the trough 23 face each other ras shown. The fronthalf ofthe transverse diameter of the tuyre is enlarged relative to the 'rear portion `V33, as shown in `Figure '7, thereby 'defining a pair of vertical ledges '3B 'at the `junction 'of the rear portion 33 and front `half of the ttuy'/ere. A central bracing web L3l is preferably `locate-d intermediate the ends of each 'slot 35 to reinforethetuyre between the'slots. The upp'er and lower walls 38 vand 39 of eaoh's1ot as preferably diverge outwardly to tend to prevent the clogging of the slots and the air blast passing therethrough will also tend to dislodge any clogging ashes, fuel, or the like.

A removable baie-plate 40 is ntted into each tuyre 21 inwardly of the air slots 35, as shown in Figures 6 and '1. This plate 4D is substantially semi-circular in cross section and is provided with a plurality of vertically spaced horizontal slots 4l which are arranged in staggered vertical relation with respect to the slots 35, as shown in Figure 6. A spacing flange 42 is located below each slot 4l and a spacing flange 43 is located in spaced relation from the top 44 of the baflle-plate 4U. The flanges 42 and 43 abut the inner face of the casing of the tuyre 21 just below the slots 35 to space the baffle walls 45 from the apertures 35, as shown in Figure 6. This arrangement locates the baie walls 45 in inwardly spaced relation to the slots 35 and causes the air from the wind box I3 to pass in an irregular path through the tuyre. The air will enter the bottom of each tuyre and pass inwardly of the baille-plate 45, out through the slots 4l, downwardly and then out through the slots 35. Air will also pass over the top i4 of the plate 40 and out through the top slot 35. The bottom feet 46 rest upon the upper face 26e of the ledge 25 which supports the tuyre to hold the plate in a proper position.

The operation of the retort is as follows:

Coal is fed into the trough 23 by the conveyor and is moved up the inclined bottom l2 in the direction of the arrows shown in Figures 1 and 5,

toward the rear end of the retort. Air passes from the wind box I3 up through the apertured sockets 26 vertically through the tuyres 21 over the baiile walls 45 then downwardly of these walls, and out through the slots 35 and over and through the coal which moves upwardly of the inclined bottom l2. Since the tuyres 21 are located at opposite sides of the trough 23, with the draft discharge slots 35 facing in a direction to discharge the air transversely across the trough 23 and coal therein, the combustion of the fuel will be greatly facilitated. Consequently, a very low grade of coal may be burned and a maximum heat obtained therefrom because of the fact that the draft is distributed across the entire transverse area, and over the entire length of the trough 23, thereby assuring the complete burning of the fuel and avoiding waste as well as delay which otherwise would be necessary in removing unburned fuel.

It is a well known fact that a low grade coal such as bug dust will not burn with a natural draft nor in a regular or conventional stoker retort, because of lack of proper draft and the clogging of the retort by coke trees and the like, which form therein. With the present construction this difficulty is avoided.

It will be noted that since the bottom of the trough is inclined upwardly and away from the Conveyor the fuel will be elevated gradually in proportion to the distance which the fuel travels within the trough and away from the conveyor.

It should be understood that since air enters the combustion chamber on opposite sides throughout the length of the retort, the incoming coal reduces air pressure on the coal at the entrance and increases air pressure as the coal pushes past and over the tuyres. This action permits the use of a large volume of air at all times to produce maximum combustion. The coal is spread evenly over the combustion chamber and is pushed forwardly and upwardly on the inclined bottom, thereby producing a wedge-like action or formation of coal, to prevent blow holes and also to prevent packing of the coal against the tuyres. The fact that the coal moves longitudinally of the retort up an incline facilitates this operation.

It should be understood that clinkers in the fire-box may be removed with conventional clinker tongs, and any desired type of ash removing mechanism may be employed. The ash removing means forms no part of this invention. A grate G of a conventional type may be used and an ash wiper, gear box and vacuum nozzle of the conventional type, may be used therewith.

By considering Figure 9, it will be noted that the fine coal and ashes work up the sloping wall of the trough 23 and vertically of the tuyres, but the vertical walls 45 of the baille plate 40 prevent the fine coal and ashes from entering the slots 4 I, since this fine material will not climb the vertical walls 45 against the pressure of the air from the wind box passing through the tuyres.

It should be noted that the spaced tuyre sections 21 extend vertically of the retort and that the slots 35 provide radial draft discharge openings for discharging a draft transversely of the trough and also transversely across the intervals between the spaced tuyre sections to set up a wall of air along each side of the trough for preventing the overheating of the tuyre sections. Furthermore, each tuyre section is individually anchored within a vertical channel 29 of the anchoring plates 28 to facilitate replacement of one section independent of the other sections, and the inner face of each tuyre section is curved transversely defining spaced rounded abutments along opposite sides of the trough.

Having described the invention, what is claimed 1. A stoker comprising a coal feeding means, a trough for receiving the coal from the feeding means, a series of vertical draft discharge tuyre sections located upon opposite sides of the trough at spaced intervals, and each tuyre section having radial draft discharge openings for discharging a draft transversely of the trough and aiso transversely across the intervals between the spaced tuyre sections to thereby set up a wall of air along each side of the trough for preventn ing the overheating of the tuyre sections.

2. A Stoker comprising a coal feeding means, a trough for receiving the coal from the feeding means, a series of vertical draft discharge tuyre sections located upon opposite sides of the trough at spaced intervals, each tuyre section having radial draft discharge openings for discharging a draft transversely of the trou-gh and also transversely across the intervals between the spaced tuyre sections to thereby set up a wall of air along each side of the trough for preventing the overheating of the tuyre sections, and means for individually anchoring each tuyre section in place to facilitate replacement of each tuyre section independently of the other sections.

3. A Stoker comprising a coal feeding means, a trough for receiving the coal from the feeding means, a series of vertical draft discharge tuyre sections located upon opposite sides of the trough at spaced intervals, each tuyre section having radial draft discharge openings for discharging a draft transversely of the trough and also transversely across the intervals between the spaced tuyre sections to thereby set up a wall of air along each side of the trough for preventing the overheating of the tuyre sections, each tuyre section having a curved inner face extending transversely thereof defining a plurality of vertical spaced rounded abutments along opposite sides of the trough.

4. A stoker comprising a coal feeding means, a trough for receiving the coal from the feeding means, a series of vertical draft discharge tuyre sections located upon opposite sides of the trough at spaced intervals, each tuyre section having radial draft discharge openings for discharging a draft transversely of the trough and also transversely across the intervals between the spaced tuyre sections to thereby set up a Wall of air along each side of the trough for preventing the overheating of the tuyre sections, said trough having laterally extending ledge portions, anchoring plates carried by said ledge portions, said anchoring plates having spaced vertical channels, rceiving said tuyre sections, and means for removably anchoring said tuyre sections in said channels to facilitate replacement of the individual tuyre sections.

FRANK L. KYGER.

REFERENCES CITED |The following references are of record in the file of this patent:

UNITED STATES PATENTS 

